I/O Forward Declarations

Typedefs
typedef basic_ios< char >	std::ios
	One of the I/O forward declarations .
typedef basic_streambuf< char >	std::streambuf
	One of the I/O forward declarations .
typedef basic_istream< char >	std::istream
	One of the I/O forward declarations .
typedef basic_ostream< char >	std::ostream
	One of the I/O forward declarations .
typedef basic_iostream< char >	std::iostream
	One of the I/O forward declarations .
typedef basic_stringbuf< char >	std::stringbuf
	One of the I/O forward declarations .
typedef basic_istringstream< char >	std::istringstream
	One of the I/O forward declarations .
typedef basic_ostringstream< char >	std::ostringstream
	One of the I/O forward declarations .
typedef basic_stringstream< char >	std::stringstream
	One of the I/O forward declarations .
typedef basic_filebuf< char >	std::filebuf
	One of the I/O forward declarations .
typedef basic_ifstream< char >	std::ifstream
	One of the I/O forward declarations .
typedef basic_ofstream< char >	std::ofstream
	One of the I/O forward declarations .
typedef basic_fstream< char >	std::fstream
	One of the I/O forward declarations .

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Detailed Description

Nearly all of the I/O classes are parameterized on the type of characters they read and write. (The major exception is ios_base at the top of the hierarchy.) This is a change from pre-Standard streams, which were not templates.

For ease of use and compatibility, all of the basic_* I/O-related classes are given typedef names for both of the builtin character widths (wide and narrow). The typedefs are the same as the pre-Standard names, for example:

     typedef basic_ifstream<char>  ifstream;

Because properly forward-declaring these classes can be difficult, you should not do it yourself. Instead, include the <iosfwd> header, which contains only declarations of all the I/O classes as well as the typedefs. Trying to forward-declare the typedefs themselves (e.g., "class ostream;") is not valid ISO C++.

For more specific declarations, see http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#10

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Typedef Documentation

typedef basic_filebuf<char> std::filebuf

One of the I/O forward declarations . Definition at line 145 of file iosfwd.

typedef basic_fstream<char> std::fstream

One of the I/O forward declarations . Definition at line 148 of file iosfwd.

typedef basic_ifstream<char> std::ifstream

One of the I/O forward declarations . Definition at line 146 of file iosfwd.

typedef basic_ios<char> std::ios

One of the I/O forward declarations . Definition at line 136 of file iosfwd.

typedef basic_iostream<char> std::iostream

One of the I/O forward declarations . Definition at line 140 of file iosfwd.

typedef basic_istream<char> std::istream

One of the I/O forward declarations . Definition at line 138 of file iosfwd.

typedef basic_istringstream<char> std::istringstream

One of the I/O forward declarations . Definition at line 142 of file iosfwd.

typedef basic_ofstream<char> std::ofstream

One of the I/O forward declarations . Definition at line 147 of file iosfwd.

typedef basic_ostream<char> std::ostream

One of the I/O forward declarations . Definition at line 139 of file iosfwd.

typedef basic_ostringstream<char> std::ostringstream

One of the I/O forward declarations . Definition at line 143 of file iosfwd.

typedef basic_streambuf<char> std::streambuf

One of the I/O forward declarations . Definition at line 137 of file iosfwd.

typedef basic_stringbuf<char> std::stringbuf

One of the I/O forward declarations . Definition at line 141 of file iosfwd.

typedef basic_stringstream<char> std::stringstream

One of the I/O forward declarations . Definition at line 144 of file iosfwd.

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